IONVIEW IMPROVEMENTS: DATA ACQUISITION AND SOFTWARE

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 我们已经着手实施更高性能的数据采集系统。这一开发还处于领先阶段，还将用作数据采集设备。这一领先阶段将使我们能够生产出成本更低的便携式SERP/SERIS系统。磁头级使用24位模数转换器，无需施加增益即可实现亚微伏分辨率，从而消除了超出转换器动态范围的问题。转换器的数据由运行在20 MHz的MicroChip微控制器管理，并通过USB接口发送到上位机。磁头还具有两个16位数模转换器，如果磁头级被配置用于电流测量并且具有被测量信号的偏移量，则可用于极化电位。USB端口为磁头供电，因此不需要其他连接。该磁头消除了对数据采集系统和机架安装放大盒的需要。模拟信号路径也大大减少，将来自其他设备的干扰可能性降至最低。我们希望磁头进一步小型化，并迁移到USB 2.0，从而实现更快的吞吐量。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. We have moved on the implementation of a higher performance data acquisition system. The development is a head stage that will also serve as a data acquisition device. This head stage will enable us to produce a lower cost portable serp/seris system. The head stage uses a 24-bit analog to digital converter enabling sub microvolt resolution without applying gain and thus eliminating the issue of exceeding the dynamic range of the converter. Data from the converter is managed by a Microchip micro-controller running at 20 MHZ and sent to the host computer via its USB interface. The head also has two 16-bit digital to analog converters that can be used for the polarization potential if the head stage is configured for current measurement and has an offset for the signal being measured. The USB port powers the head so no other connection is required. The head eliminates the need for a data acquisition system and rack mount amplifier box. The analog signal path is also greatly reduced minimizing the possibility of interference from other equipment. We hope to further miniaturize the head and to migrate to USB 2.0 enabling much faster throughput.